if there are no tracks and droppings = no Wabbits ..
you should see grazing on the shrubs etc small poplar they eat the bark .. it will be dense bush and in you need to push your way in trees to find them here , they need cover except at night you will see lots of tracks but no Wabbits find the dense bush .. bingo
Go Slow bobbing head as in taking as many anlges of a look ahead as you can then move slowly and repeat..
If there are no birch trees in the area, look for Aspen saplings.
In the southern foothills, Mature willows are for bedding, young Aspen (especially saplings) for feeding. Hunt the bedding areas mid day, feeding areas at first and last light. Cutting down some trees or making a pile of fresh branches for food is very effective for drawing in rabbits.